Spiratone Colorflow II filters

ibcrewin

Ah looky looky
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Apr 28, 2006
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I have 4 spiratone Colorflow II filters I picked up at a garage sale once. If you've never seen or heard of these before they are pretty neat. They are filters with a range of colors each. The color changes as you rotate a polarizer over the filter.

Anyhow, Does anybody know how to calculate the exposures for these? The colors change so much in some cases the filter factor has to be different from one extreme to the other. I might just have to dig out the digital camera and run some tests.

Thanks!
 
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